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Lithium ferric manganese phosphate cathode material and manufacturing method thereof

A technology of lithium iron manganese phosphate, cathode material, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., to achieve high dispersion and fluidity

Active Publication Date: 2017-02-22
深圳市北宸创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific energy of the traditional lithium iron phosphate single battery is only 110-120Wh / kg. After being combined into a battery pack, the energy density of the battery system is less than 90Wh / kg

Method used

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  • Lithium ferric manganese phosphate cathode material and manufacturing method thereof
  • Lithium ferric manganese phosphate cathode material and manufacturing method thereof
  • Lithium ferric manganese phosphate cathode material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Weigh 7.5KG of Q235 scrap iron, add high-efficiency surfactant (allyl polyethylene glycol: fatty alcohol and ethylene oxide condensate: ether phosphate = 4:3:2 (mass ratio)) 1KG, Add 250KG of 10% dilute phosphoric acid, put it into a 1000L reactor; raise the temperature to about 80°C, fully react without stirring, and stabilize the pH value at 3.0, that is, the surface reaction is completed;

[0028] 2. Filter the solution in the previous step through a plate frame filter or a PP barrel-type precision filter to obtain a ferrous phosphate solution, which is the iron source for use;

[0029] 3. After weighing the iron source to determine the accurate quality of the solution, pump it into a 1000L reaction kettle;

[0030] 4. Stir for a while, take three parallel samples for detection, and determine the total iron content;

[0031] 5. Add 250KG of 10% phosphoric acid and 50KG of pure water through calculation;

[0032] 6. Raise the temperature to 100°C, and control the...

Embodiment 2

[0041]1. Weigh 5KG DC07 leftovers and 3KG ferrous oxide, add high-efficiency surfactant (allyl polyethylene glycol: fatty alcohol and ethylene oxide condensate: ether phosphate = 4:2:3 (mass ratio) ) 0.8KG, add 250KG of 10% dilute phosphoric acid, and put it into a 1000L reactor;

[0042] Raise the temperature to about 80°C, fully react without stirring, and stabilize the pH value at 2.0, that is, the surface reaction is completed;

[0043] 2. Filter the solution in the previous step through a plate frame filter or a PP barrel-type precision filter to obtain a ferrous phosphate solution, which is the iron source for use;

[0044] 3. After weighing the iron source to determine the accurate quality of the solution, pump it into a 1000L reaction kettle;

[0045] 4. Stir for a while, take three parallel samples for detection, and determine the total iron content;

[0046] 5. Add 250KG of 10% phosphoric acid and 50KG of pure water through calculation;

[0047] 6. Raise the tempe...

Embodiment 3

[0056] 1. Weigh 5.5KG iron powder and 3KG ferrous oxide, add organic high-efficiency surfactant (allyl polyethylene glycol: fatty alcohol and ethylene oxide condensate: ether phosphate = 2: 1: 5 (mass ratio)) 0.8KG, add 10% dilute phosphoric acid 250KG, put in 1000L reactor;

[0057] Raise the temperature to about 80°C, fully react without stirring, and stabilize the pH value at 5.0, that is, the surface reaction is completed;

[0058] 2. Filter the solution in the previous step through a plate frame filter or a PP barrel-type precision filter to obtain a ferrous phosphate solution, which is the iron source for use;

[0059] 3. Weigh the iron source to determine the exact mass of the solution, and then pump it into a 1000L reaction kettle. broken

[0060] 4. Stir for a while, take three parallel samples for detection, and determine the total iron content;

[0061] 5. Add 250KG of 10% phosphoric acid and 50KG of pure water through calculation;

[0062] 6. Raise the temperat...

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Abstract

The invention provides a lithium ferric manganese phosphate cathode material and a manufacturing method thereof. By using sheet iron, scrap iron, iron slag, inorganic ferric salt, ferric oxide or organic iron and manganic carbonate, manganese oxide, a lithium source and the like are added into a diluted phosphoric acid solution to synthesize and prepare the high voltage platform lithium battery cathode material, namely lithium ferric manganese phosphate. The lithium ferric manganese phosphate produced in the invention is extremely low in impurity content, the product has high dispersibility and flowability, the polarization ratio is more than 0.95 respectively; the size distribution is in a relatively narrow range, wherein D50 is stabilized about 5 microns. An SEM electron microscope indicates that the product is sheet-like in shape and has extremely high compaction density, and XRD also indicates that the obtained lithium ferric manganese phosphate product is pure-phase, namely is a lithium ferric manganese phosphate product of an orthogonal plate-like / sheet-like structure. Through the test of a button cell simulating battery prepared from the materials, a voltage platform is fundamentally 4.18 to 4.2 V, and the 0.1C capacity reaches 161 to 165 mAh / g.

Description

technical field [0001] The invention relates to a lithium iron manganese phosphate positive electrode material and a manufacturing method thereof, in particular to a method for preparing high-voltage platforms and Specific capacity lithium iron manganese phosphate cathode battery material method. Background technique [0002] With the country's policy support for new energy electric vehicles and the market application of electric vehicles, there are higher requirements for the power source of electric vehicles - lithium batteries. The most important thing is that the voltage platform and specific capacity of lithium batteries are more suitable for the development requirements of electric vehicles. The specific energy of the traditional lithium iron phosphate single battery is only 110-120Wh / kg. After being combined into a battery pack, the energy density of the battery system is less than 90Wh / kg. Therefore, how to increase the battery capacity, thereby increasing the crui...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/052C01B25/45
CPCC01B25/45H01M4/5825H01M10/052Y02E60/10
Inventor 常开军
Owner 深圳市北宸创新材料科技有限公司
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